Emotron EMX-R-15S, EMX-R-15E, EMX-R Series, EMX-R-25S, EMX-R-25E Instruction Manual
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EMX™-R
DRIVE SYSTEM
INSTRUCTION MANUAL - English
Valid for the following models:
EMX-R-15S
EMX-R-15E
EMX-R-25S
EMX-R-25E
EMX-R-35S
EMX-R-35E
Version 2.x
EMX™-R
DRIVE SYSTEM
INSTRUCTION MANUAL - English
Document number: 01-3333-01
Edition: r2
Date of release: 2006-02-15
© Copyright Emotron AB 2005 - 2006
Emotron retain the right to change specifications and
illustrations in the text, without prior notification. The
contents of this document may not be copied without the
explicit permission of Emotron AB.
The product is protected as follows:
Patents: US 4 868 478; EP 0 285 637; SE 8604308-0
US 5 315 224; EP 0 507 835; SE 9002217-9
US 6 628 100; SE 9902821-9
SE 0100814-3
Registered design: US 462 937; DE 400 05 393.4; SE 66 630
Safety instructions
During installation
• Read the instruction manual completely before installation and commissioning.
• The installation must be carried out by qualified personnel.
• General conditions and regulations for the installation and operation of
electrical machinery must be observed.
• Measures to protect against personal injury and damage to the machine
must be taken following local rules and regulations.
• The drive system EMX-R is intended for permanent installation.
• Cables may not be connected or disconnected while the supply voltage is
on.
• Check that the equipment is correctly connected before it is taken into use,
see the instructions in the chapter on Mounting/Connection.
• Faults that arise due to faulty installation or operation are not covered by the
guarantee.
During operation
• Measurements in the control unit, during operation, must only be carried
out on the terminals and only by authorized personnel. NOTE! Great care
must be taken.
• The units may not be opened or disassembled during operation.
During disassembly and scrapping
• The housing of the control unit is made from aluminium and steel. The
material must be handled and recycled following the relevant laws.
• The circuit board contains small amounts of tin and lead, which must be
handled and recycled in accordance with the relevant laws.
• The motor is made from copper, plastic, aluminium and iron. These materials must be handled and recycled in accordance with the relevant laws.
Emotron AB 01-3333-01r2 1
2 Emotron AB 01-3333-01r2
Contents
1. Description.................................................................................. 5
1.1 Introduction................................................................................................. 5
1.2 Product range ............................................................................................. 5
1.3 Operating indicators / built-in functions ................................................... 6
1.3.1 Automatic purging mode / holding torque................................................ 7
1.3.2 Rotation monitor (DIP switch 4)................................................................. 8
1.3.3 Protection of the control unit ..................................................................... 9
2. Mounting/connection.............................................................. 11
2.1 Mounting .................................................................................................. 11
2.1.1 Sensor for rotation monitor..................................................................... 12
2.2 Connection ............................................................................................... 12
2.2.1 When switching off .................................................................................. 13
2.2.2 Recommendations with respect to EMC................................................ 13
2.2.3 Priority switch / defrosting / manual control......................................... 14
2.2.4 Manual control using a 10 kOhm potentiometer .................................. 14
2.2.5 Test switch ............................................................................................... 15
2.2.6 Choice of maximum speed ..................................................................... 17
2.2.7 Setting DIP switches ................................................................................ 18
2.2.8 Speed controller ...................................................................................... 19
2.2.9 Parallel connection .................................................................................. 19
2.2.10 Heat recovery on cooling – summer/winter switch............................... 20
2.2.11 Analogue output signal (only available on Model E) ............................. 20
2.2.12 Potentiometer with low resistance, 100 Ohm to 5 kOhm
(only available on Model E) ..................................................................... 20
3. Maintenance/troubleshooting................................................ 21
3.1 Maintenance ............................................................................................ 21
3.2 Motor diagnosis ....................................................................................... 21
3.3 Troubleshooting ....................................................................................... 22
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4. Technical data ......................................................................... 25
4.1 The drive system’s operation using different control signals................ 26
4.2 Choice for sizes of drive system and belt pulley .................................... 29
4.3 Accessories and documentation ............................................................ 30
5. Appendix ................................................................................... 31
4 Emotron AB 01-3333-01r2
1. Description
1.1 Introduction
EMX-R is a series of speed controlled drive systems specially designed for driving rotary heat exchangers. The drive system consist of a motor and its associated control unit.
EMX-R completely replaces drive systems EMS-VVX 1, 2-4N, 2-4N/ET and
2-4EM as well as the drive systems EMS-VVX 15, 25 and 35. All mentioned
drive systems have completely been replaced by EMX-R.
The new drive system EMX-R is based, like its predecessor, on the SR-motors
(SR=Switched Reluctance). These motors make it possible to drive heat
exchanger rotors up to 3.5 metres in diameter without gears.
1.2 Product range
EMX-R is available in three sizes for rotors up to around 3.5 m. They come in
sizes 15, 25 and 35 (for other rotor sizes, please contact the local distributor or
Emotron AB).
The control unit is available in two versions, S and E, where Model E has an
extra circuit board for increased functionality. Built-in functions included in the
Model S are:
• Automatic purging operation
• Rotation monitor - integrated electronics or with external rotation sensor
• Alarm relay
•Test switch
• Priority switch/defrosting
• Heat recovery on cooling with external differential thermostat
In addition to the functions included in Model S, the Model E includes:
• Display of the rotor speed in r/min when the external rotation sensor is connected.
• Analogue output signal proportional to the speed of rotation of the motor.
• Heat recovery on cooling with external temperature sensors.
• Input for potentiometer with low resistance, 100 Ohm to 5 kOhm.
Emotron AB 01-3333-01r2 Description 5
• Prepared for serial communication.
1.3 Operating indicators / built-in functions
Two LEDs, one red and one green, are used on the Model S for indication,
while the Model E has an LED display as follows:
Table 1 Operating indication – Model S
Slow flashing – Purging mode/Low control signal
Green
Rapid flashing – Operation, the motor rotates continuously
Lit for two seconds – Magnet passing rotation sensor
Lit - RotoSens measures the load on the motor during acceleration
Lit or flashing LED indicates alarm, see also the chapter on troubles-
Red
hooting
Table 2 Operating indication – Model E
Purging mode. Low control signal
The speed of the rotor in rpm. At start a speed is displayed according to
the gear ratio rotor/motor = 1:25. After 2 pulses from the rotation monitor, the correct speed of rotation of the rotor is displayed. Range 0.2–99
rpm.
RotoSens is selected using the DIP-switch (4) and with no rotation sensor connected
Lit for two seconds when the magnet passes the rotation sensor
RotoSens measures the load on the motor during acceleration
Summer operation/heat recovery on cooling
No rotation monitor - DIP 4 in the OFF position and jumper 31-32
An alarm is indicated by the letter F followed by a number. See also the
chapter on troubleshooting.
6Description Emotron AB 01-3333-01r2
1.3.1 Automatic purging mode / holding torque
When the control signal is low, <1.5 V at 0–10 V, the drive system switches to
purging mode. In purging mode the motor shaft turns two revolutions every 10
minutes, which is equivalent to around 30 degrees of rotation by the heat
exchanger rotor. This slow rotation does not provide any significant heat transfer, but simply serves to keep the rotor clean.
Most of the time the rotor seals keep the rotor stationary, but if the rotor seals
are not touching the rotor and the air flow is not perpendicular to the rotor, the
air flow may cause the rotor to rotate. To prevent unintentional heat recovery in
this situation the motor is used to provide a holding torque to keep the rotor
stationary.
The first time the drive system goes into purging mode after the power is
switched on this holding torque is not activated, since many rotors do not
require an active holding torque to keep them stationary. A rotor that does
require a holding torque will then begin to turn slowly. The drive system immediately brakes this motion, reducing the speed to zero, and then applies a constant holding torque to keep the rotor stationary. The drive system has now
learned which rotors require a holding torque, and which do not. The holding
torque is at least 50% higher than the torque required for operation just before
is should stand still.
If a holding torque has been applied and you grasp the drive belt and try to turn
the rotor by hand, the torque will progressively increase.
The holding torque is generated by passing a current through one of the motor
phases. The higher the torque that is required, the higher the current. This current produces a noise that gets louder as the current increases. Integrated in the
control unit are three motor protection breakers, one for each motor phase. The
motor protection also protects the motor when the holding torque is activated.
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1.3.2 Rotation monitor (DIP switch 4)
Two different rotation monitors can be selected. The first, RotoSens™, which is
an integrated electronic rotation monitor, and secondly a rotation monitor
using a rotation sensor.
RotoSens uses the motor as the sensor. By allowing the control unit to measure
the load on the motor, you can determine whether the drive belt has broken.
When the drive belt has broken the motor load will be low. As the rotors which
rotate very easily also give a low load on the motor, it is necessary to also measure the load during acceleration - you then get a measurement of the rotor’s
moment of inertia. After 2 minutes of operation at a low load, a load measurement is made during acceleration. If the drive belt is broken an alarm is given, if
it is undamaged the load measurement during acceleration is repeated again
after 24 hours. In cleaning mode, measurement during acceleration is made
once every 24 hours.
The rotation monitor with sensor has a magnet fitted on the periphery of the
rotor. The magnet activates the sensor once every revolution. Should, for example, a belt break and the rotor stops, the pulses cease and an alarm is given. The
time until the alarm is given is speed dependent and is 24 seconds at max.
speed, 20 minutes at min. speed and about 8 hours in purge mode.
NOTE: In order to use RotoSens the load on the motor should not be to low.
The minimum diameter for the rotor and belt pulley for each size of the drive
system must be:
EMX-R-15: Belt pulley
EMX-R-25: Belt pulley ≥ 63 mm, Rotor diameter ≥ 1200 mm
EMX-R-35: Belt pulley ≥ 100 mm, Rotor diameter ≥ 2000 mm
If the belt pulley or rotor are smaller RotoSens can not be used, however,
the rotation monitor with sensor can always be used.
≥ 63 mm, Rotor diameter ≥ 630 mm
The rotation monitors give alarms through operating indications and via the
alarm relay, the motor does not stop with an alarm.
For operation without an external rotation sensor the DIP-switch 4 must be set
in position “OFF” (downwards), which means the built-in electronic rotation
monitor RotoSens is connected.
8Description Emotron AB 01-3333-01r2
For operation without both an external and the built-in electronic rotation
monitor RotoSens the DIP-switch 4 also must be set in position “OFF”, but
then a strap must be fitted between terminals 31 and 32.
1.3.3 Protection of the control unit
The control unit is protected by monitoring for both over-voltage and undervoltage. If the supply voltage goes over or under the allowed limits, the control
unit is disconnected and the motor stops. The motor starts again automatically
when the supply voltage returns to its normal value.
The control unit has built-in motor protection that protects against overloading, and external motor protection is not required. Power supply to the motor is
cut in the event of overload. In order to restart the drive system, the supply voltage to the control unit should be temporarily disconnected for at least 5 seconds.
Built-in short circuit protection protects against short circuits between the
phases of the motor and between the phases and earth.
Table 3 Protection and alarm functions
Protective
function
Supply fault, overvoltage
Supply fault,
under-voltage
Pre-alarm, rotation
monitor
Rotation
monitor
Pre-alarm, motor
protection/overload
Motor protection/
overload
Short circuit
1) RotoSens - manual, disconnect and reconnect the power supply.
Rotation monitor with sensor - automatic.
Emotron AB 01-3333-01r2 Description 9
External alarm
with alarm relay
Yes, immediately Automatic
No
Yes
No
Yes, immediately
Restart Alarm reset
Motor not stopped
The system tries
to reset three
times
Manual, disconnect and reconnect power
supply
Automatic
1)
Automatic
Manual, disconnect and reconnect power
supply
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